Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 365
1469. PORTABLE STEAM DERRICK, on swivelled platform, balanced by boiler. … 1470. SWING-BOOM CRANE, with atravelling truck and trolley lift. Boom re-volving on radial rollers.
Mechanical movements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
